Ancient empires
1. Achaemenid Persian Empire - 7.5 million km² (under Darius the Great)
2.Han Chinese Empire - 6 million km²
3.Roman Empire - 5.9 million km² (under Emperor Trajan)
4.Macedonian Empire - 5.4 million km² (under Alexander the Great)
5.Maurya Magadha Empire - 5 million km² (under Ashoka the Great)
6.Hunnic Empire - 4 million km² (under Attila the Hun in 441)
7.Seleucid Empire - 3.9 million km²
8.Gupta Magadha Empire - 3.5 million km² (under Chandragupta II in 400)
9.Sassanid Persian Empire - 3.5 million km²[1] (under Khosrau II in 626)
10.Parthian Empire - 2.84 million km² (Under Mithridates II 123–88 BCE)
11.Median Empire - 2.8 million km²
12.Neo-Assyrian Empire - 1.4 million km²
13.Aksumite Empire - 1.25 million km²[1]
14.Egyptian Empire - 1 million km²
15.Akkadian Empire - 650,000 km²
16.Hittite Empire - 510,000 km²
17.Neo-Babylonian Empire - 500,000 km²
18.Armenian Empire - 400,000 km²